Stone Direct Mount Round Chainring for ROTOR Cranksets – Narrow-Wide 7075 Aluminum, MTB 30–40T / Road 42–58T
Upgrade your drivetrain with the Stone Direct Mount Round Chainring, engineered specifically for ROTOR direct mount cranksets. Precision CNC-machined from high-strength 7075-T651 aluminum, it delivers excellent stiffness, durability, chain retention, and smooth shifting for both MTB and road bike setups.
Key Features
- Brand: Stone
- Type: Direct Mount Round Chainring
- Tooth Profile: Narrow-Wide
- Shape: Round
- Color: Black, anodized finish
- Speed Compatibility: 9 / 10 / 11 / 12-speed chains (not for AXS Flattop chain)
- Material: High-strength Aluminum 7075-T651
- Thickness: 8 mm
- Hardness: HB150
- CNC Precision: 0.03 mm
- Chainline / Offset: Same as the original ROTOR chainring
- Package Includes: 1 × Bike Chainring
Compatibility
This chainring is designed for the following ROTOR cranksets:
- ROTOR Kapic
- ROTOR ALDHU
- ROTOR Vegast
- ROTOR Hawk
- ROTOR Raptor
- ROTOR INpower
- ROTOR 2INpower
MTB & Road Bike Compatibility
This chainring is compatible with both MTB cranksets and road bike cranksets.
Spindle Compatibility
- ROTOR ALDHU 24 mm spindle
- ROTOR ALDHU 30 mm spindle
Available Sizes
| Application | Available Sizes |
|---|---|
| MTB | 30T / 32T / 34T / 36T / 38T / 40T |
| Road Bike | 42T / 44T / 46T / 48T / 50T / 52T / 54T / 56T / 58T |
Offset and chainline are 100% the same as the original chainring.
Installation Guide
There is an arrow mark on the chainring. For correct installation, position the arrow mark between the numbers “2” and “4” on the crankset.
Please make sure the chainring is installed in the correct direction before riding.
Important Note for Shimano 12-Speed Chains
If using a Shimano 12-speed chain, please replace the original Shimano 12-speed quick link with another compatible 12-speed quick link, such as:
- KMC
- YBN
- SUMC
- Other compatible 12-speed quick links
The original Shimano 12-speed quick link may be too narrow for proper compatibility.
Note for SRAM T-Type Chains
This standard version is not compatible with SRAM T-Type 12-speed chains. If you need a version for SRAM T-Type chains, please contact us for customization.
Product Advantages
1. Premium 7075-T651 Aluminum
Made from high-strength 7075-T651 aluminum alloy supplied by Aleris, a U.S. aluminum supplier serving major aircraft manufacturers including Airbus, Boeing, and Bombardier. This material provides:
- Excellent stiffness
- High strength
- Long-lasting durability
- Reliable performance under heavy riding conditions
2. High-Precision CNC Machining
Stone chainrings are manufactured using high-precision CNC equipment from Taiwan and Germany.
- Machining accuracy: 0.03 mm
- Improved fitment
- Better drivetrain smoothness
- Consistent tooth profile and chain engagement
3. Narrow-Wide Tooth Design
Stone’s newly designed narrow-wide tooth profile provides:
- Improved chain retention
- Reduced risk of chain drop
- Better mud and dirt self-cleaning performance
- Lower drivetrain noise
- Stable performance for MTB and road riding
